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Microbiology
Norway
2025

D-Index & Metrics

Microbiology

D-Index
74
Citations
22395
World Ranking
1561
National Ranking
3

Ingar Olsen publication distribution in Microbiology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Microbiology in 2026. The highlighted bar marks where Ingar Olsen sits on this spectrum.

55–64 publications: 8 scientists 65–74 publications: 29 scientists 75–84 publications: 55 scientists 85–94 publications: 112 scientists 95–104 publications: 137 scientists 105–114 publications: 190 scientists 115–124 publications: 235 scientists 125–134 publications: 234 scientists 135–144 publications: 288 scientists 145–154 publications: 264 scientists 155–164 publications: 264 scientists 165–174 publications: 253 scientists 175–184 publications: 276 scientists 185–194 publications: 190 scientists 195–204 publications: 233 scientists 205–214 publications: 207 scientists 215–224 publications: 198 scientists 225–234 publications: 155 scientists 235–244 publications: 161 scientists 245–254 publications: 160 scientists 255–264 publications: 146 scientists 265–274 publications: 139 scientists 275–284 publications: 148 scientists 285–294 publications: 115 scientists 295–304 publications: 96 scientists 305–314 publications: 88 scientists 315–324 publications: 106 scientists 325–334 publications: 65 scientists 335–344 publications: 76 scientists 345–354 publications: 64 scientists 355–364 publications: 62 scientists 365–374 publications: 65 scientists 375–384 publications: 61 scientists 385–394 publications: 34 scientists 395–404 publications: 44 scientists 405–414 publications: 36 scientists 415–424 publications: 35 scientists 425–434 publications: 29 scientists 435–444 publications: 33 scientists 445–454 publications: 34 scientists 455–464 publications: 25 scientists 465–474 publications: 26 scientists 475–484 publications: 20 scientists 485–494 publications: 19 scientists 495–504 publications: 16 scientists 505–514 publications: 17 scientists 515–524 publications: 23 scientists 525–534 publications: 14 scientists 535–544 publications: 14 scientists 545–554 publications: 18 scientists 555–564 publications: 12 scientists 565–574 publications: 7 scientists 575–584 publications: 9 scientists 585–594 publications: 9 scientists 595–604 publications: 9 scientists 605–614 publications: 7 scientists 615–624 publications: 9 scientists 625–634 publications: 7 scientists 635–644 publications: 4 scientists 645–654 publications: 5 scientists 655–664 publications: 6 scientists 665–674 publications: 7 scientists 675–678 publications: 3 scientists 679+ publications: 99 scientists
55 publications 679+

This scientist: 265 publications — 69th percentile

69% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 679 publications or more.

Ingar Olsen D-index placement in Microbiology in 2026

The chart shows the D-index (discipline H-index) distribution of Microbiology scientists ranked by Research.com in 2026. The highlighted bar marks where Ingar Olsen sits on this spectrum.

40 D-Index: 30 scientists 41 D-Index: 86 scientists 42 D-Index: 90 scientists 43 D-Index: 117 scientists 44 D-Index: 122 scientists 45 D-Index: 123 scientists 46 D-Index: 108 scientists 47 D-Index: 110 scientists 48 D-Index: 106 scientists 49 D-Index: 109 scientists 50 D-Index: 129 scientists 51 D-Index: 111 scientists 52 D-Index: 116 scientists 53 D-Index: 127 scientists 54 D-Index: 134 scientists 55 D-Index: 134 scientists 56 D-Index: 111 scientists 57 D-Index: 136 scientists 58 D-Index: 162 scientists 59 D-Index: 151 scientists 60 D-Index: 139 scientists 61 D-Index: 122 scientists 62 D-Index: 126 scientists 63 D-Index: 144 scientists 64 D-Index: 109 scientists 65 D-Index: 103 scientists 66 D-Index: 124 scientists 67 D-Index: 112 scientists 68 D-Index: 103 scientists 69 D-Index: 131 scientists 70 D-Index: 93 scientists 71 D-Index: 93 scientists 72 D-Index: 96 scientists 73 D-Index: 92 scientists 74 D-Index: 80 scientists 75 D-Index: 66 scientists 76 D-Index: 87 scientists 77 D-Index: 60 scientists 78 D-Index: 73 scientists 79 D-Index: 59 scientists 80 D-Index: 57 scientists 81 D-Index: 55 scientists 82 D-Index: 47 scientists 83 D-Index: 77 scientists 84 D-Index: 50 scientists 85 D-Index: 45 scientists 86 D-Index: 42 scientists 87 D-Index: 41 scientists 88 D-Index: 32 scientists 89 D-Index: 38 scientists 90 D-Index: 35 scientists 91 D-Index: 34 scientists 92 D-Index: 27 scientists 93 D-Index: 26 scientists 94 D-Index: 33 scientists 95 D-Index: 22 scientists 96 D-Index: 37 scientists 97 D-Index: 22 scientists 98 D-Index: 21 scientists 99 D-Index: 22 scientists 100 D-Index: 30 scientists 101 D-Index: 16 scientists 102 D-Index: 20 scientists 103 D-Index: 17 scientists 104 D-Index: 19 scientists 105 D-Index: 16 scientists 106 D-Index: 19 scientists 107 D-Index: 18 scientists 108 D-Index: 14 scientists 109 D-Index: 10 scientists 110 D-Index: 9 scientists 111 D-Index: 7 scientists 112 D-Index: 11 scientists 113 D-Index: 6 scientists 114 D-Index: 15 scientists 115 D-Index: 10 scientists 116 D-Index: 12 scientists 117 D-Index: 7 scientists 118 D-Index: 10 scientists 119 D-Index: 10 scientists 120 D-Index: 11 scientists 121 D-Index: 2 scientists 122 D-Index: 7 scientists 123 D-Index: 12 scientists 124 D-Index: 5 scientists 125 D-Index: 9 scientists 126 D-Index: 6 scientists 127+ D-Index: 95 scientists
40 D-Index 127+

This scientist: 74 D-Index — 72nd percentile

72% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 127 D-Index or more.

Research.com Recognitions

  • 2025 - Research.com Microbiology in Norway Leader Award
  • 2022 - Research.com Microbiology in Norway Leader Award

Overview

Ingar Olsen is affiliated with the University of Oslo in Norway and primarily conducts research within the fields of Dentistry and Medicine. Their work has a significant focus on periodontics, physiology, and molecular biology, with additional contributions to neurology and pharmacy.

The scientist's research topics cover various aspects of oral microbiology and periodontitis, salivary gland disorders and functions, and Alzheimer's disease research and treatments. Other notable areas of interest include oral health pathology and treatment, S100 proteins and annexins, dental health and care utilization, as well as oral and gingival health research.

Frequent publication venues include:

  • Den Norske tannlegeforenings tidende
  • Journal of Oral Microbiology
  • Medical Hypotheses
  • Expert Review of Anti-infective Therapy
  • Journal of Alzheimer s Disease Reports

Ingar Olsen has collaborated repeatedly with several coauthors, among them:

  • Lise Lund Håheim
  • Dag S. Thelle
  • Kjersti S. Rønningen
  • Sim K. Singhrao
  • Per E. Schwarze

The scientist's recent publications include:

  • "Is Porphyromonas gingivalis involved in Parkinson's disease?" (2020, European Journal of Clinical Microbiology & Infectious Diseases)
  • "Low levels of salivary lactoferrin may affect oral dysbiosis and contribute to Alzheimer's disease: A hypothesis" (2020, Medical Hypotheses)
  • "Interaction between genetic factors, Porphyromonas gingivalis and microglia to promote Alzheimer's disease" (2020, Journal of Oral Microbiology)
  • "Porphyromonas gingivalis-Induced Neuroinflammation in Alzheimer's Disease" (2021, Frontiers in Neuroscience)
  • "Porphyromonas gingivalis infection may contribute to systemic and intracerebral amyloid-beta: implications for Alzheimer's disease onset" (2020, Expert Review of Anti-infective Therapy)

Best Publications

  • Defining the Normal Bacterial Flora of the Oral Cavity

    Jørn A. Aas;Jørn A. Aas;Bruce J. Paster;Bruce J. Paster;Lauren N. Stokes;Ingar Olsen

  • Systemic Diseases Caused by Oral Infection

    Xiaojing Li;Kristin M. Kolltveit;Leif Tronstad;Ingar Olsen

  • Bacteria of Dental Caries in Primary and Permanent Teeth in Children and Young Adults

    Jørn A. Aas;Jørn A. Aas;Ann L. Griffen;Sara R. Dardis;Alice M. Lee

  • The breadth of bacterial diversity in the human periodontal pocket and other oral sites.

    Bruce J Paster;Ingar Olsen;Jørn A Aas;Floyd E Dewhirst

  • Biofilm-specific antibiotic tolerance and resistance.

    I. Olsen

  • Can oral bacteria affect the microbiome of the gut

    Ingar Olsen;Kazuhisa Yamazaki

  • Microbiota of periapical lesions refractory to endodontic therapy.

    Pia Titterud Sunde;Ingar Olsen;Gilberto J. Debelian;Leif Tronstad

  • Phylogeny of Bacteroides, Prevotella, and Porphyromonas spp. and related bacteria.

    B J Paster;F E Dewhirst;I Olsen;G J Fraser

  • Phylogeny of 54 representative strains of species in the family Pasteurellaceae as determined by comparison of 16S rRNA sequences.

    F E Dewhirst;B J Paster;I Olsen;G J Fraser

  • Bacterial Profiles of Root Caries in Elderly Patients

    Dorita Preza;Ingar Olsen;Jørn A. Aas;Tiril Willumsen

  • Synovial inflammation in active rheumatoid arthritis and psoriatic arthritis facilitates trapping of a variety of oral bacterial DNAs.

    K. Moen;J. G. Brun;M. Valen;L. Skartveit

  • Fluorescence in situ hybridization (FISH) for direct visualization of bacteria in periapical lesions of asymptomatic root-filled teeth

    Pia T. Sunde;Ingar Olsen;Ulf B. Göbel;Dirk Theegarten

  • Genetic Structure of Population of Bacillus cereus and B. thuringiensis Isolates Associated with Periodontitis and Other Human Infections

    Erlendur Helgason;Dominique A. Caugant;Ingar Olsen;Anne-Brit Kolstø

  • Comorbidity of periodontal disease : two sides of the same coin? An introduction for the clinician

    Palle Holmstrup;Christian Damgaard;Christian Damgaard;Ingar Olsen;Björn Klinge

  • Sphingolipids in Bacteria and Fungi

    Ingar Olsen;Erik Jantzen

  • Can oral infection be a risk factor for Alzheimer's disease?

    Ingar Olsen;Simarjit Kaur Singhrao

  • Denture stomatitis. Occurrence and distribution of fungi.

    Ingar Olsen

  • Possible role of Porphyromonas gingivalis in orodigestive cancers.

    Ingar Olsen;Özlem Yilmaz

  • Assessment of periradicular microbiota by DNA-DNA hybridization.

    P. T. Sunde;L. Tronstad;E. R. Eribe;P. O. Lind

  • Porphyromonas gingivalis disturbs host-commensal homeostasis by changing complement function.

    Ingar Olsen;John D. Lambris;George Hajishengallis

  • Evaluation of the Effect of Two Chlorhexidine Preparations on Biofilm Bacteria In Vitro: A Three-Dimensional Quantitative Analysis

    Ya Shen;Wei Qian;Christopher Chung;Ingar Olsen

Frequent Co-Authors

Dominique A. Caugant
Dominique A. Caugant Norwegian Institute of Public Health
Bruce J. Paster
Bruce J. Paster Harvard University
Floyd E. Dewhirst
Floyd E. Dewhirst Harvard University
Haroun N. Shah
Haroun N. Shah Middlesex University
Jan Potempa
Jan Potempa University of Louisville
Fred C. Tenover
Fred C. Tenover University of Dayton
Roland Jonsson
Roland Jonsson University of Bergen
Sigmund S. Socransky
Sigmund S. Socransky Harvard University
Dag S. Thelle
Dag S. Thelle University of Oslo
Per E. Schwarze
Per E. Schwarze Norwegian Institute of Public Health

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